Unloader for compressors.



H. V. HAIGHT. v

.UNLOADER FOR COMPRESSORS.

APPLICATION FILED MAR.2, l9l7.

1,291,854. Patented Jan. 21, 19 19.

3 SHEETS-SHEET l- INVE/VTOR H. V. HAIGHTQ UNLOADER FOR COMPRESSORS.

APPLICATION man MAR. 2. I917.

1,291,854. I Patented Jan. 21,1919.

3 SHEETSSHEET 2- n. I mmvmk M A77 R/VEY H. V. HAIGHT.

UNLOADER FOR COMPRESSORS.

APPLICATION FILED MAR. 2.19M.

1,291,854. Patented Jan. 21, 1919.

STATES PATENT, OFFICE.

HARRY V. HAI GHT, 0F SHERBROOKE, QUEBEC, CANADA, ASSIGNOR TO INGERSOLL-BAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

UNLOADER FOR GOMPRESSOBS.

To all whom it may concern:

Be it known that I, HARRY V. HAroH'r, a subject of the Crown of GreatBritain, residing at Sherbrooke, in the Province of Quebec, Dominion ofCanada, have invented a certain new and useful Improvement in Unloadersfor Compressors, of Which-the following is a specification.

This invention relates to compressors and in particular to intake valvesfor admitting the fluid to be compressed and also to regu-' late theload on the compressor.

The objects of my invention are to provide a compressor with a valveadapted to admit fluid to the compressor and to be thrown out ofoperation to relieve the load on the compressor.

With these and other objects in view, my invention consists in thefeatures of construction and operation set forth in the followinspecification and claims and illustrate in the accompanying drawings.

In the drawings forming a part of this specification,

' Figure 1 shows one construction,

Fig. 2 shows another type of my improved construction,

Fig. 3 shows a type of my improved construction provided with a valveand unloader when used on the upper part of the compressor,

Fig. 4 shows a further modification of my valve and unloader,

Fig. 5 is a cross section of the valve casing on the line A-A of Fig. 3,

Fig. 6 is across section of the valve casing on the line B-B of Fig. 3,and

Fig. 7 is a longitudinal section of the valve casing and valves. I

Referring to Fig. 1 of the drawing, my improved inlet valve and unloaderis shown in the position it occupies when the compressor is beingoperated under load. As shown in this fi re, the valve comprises ahollow tubular s ell 1 having ports or open: ings 2 over which leaves 3are fitted to make a tight joint. Each leaf 3 is fastened separately tothe shell 1 referablv by means of screws 4 extendin t rough the shell 1,the leaf 3 and a bac g plate 5. Extendmg from the shell 1 is a piston 6Whlch may be type of my improved formed integrally with the shell 1 orsepa-' rately as shown m Fig. 4. The piston 6 is Specification ofLetters Patent.

Application filed March 2, 1917. Serial No. 152,019.

Patented J an. 21, 1919.

operated forwardly and backwardly in a cylinder 7 which is secured inposition on the wall of the intake passage 8. With the intake passagesarranged in the lower portions of the cylinder, as shown in Fig. 1, whenthere is no pressure su plied in the cylinder 7 below the piston 6 trough pipe 9 the piston'falls of 1ts own weight to the lower portion ofthis cylinder 7 and thus the valve 1s lowered from its seat 10 opening afree passage from the intake passage 11 to the cylinder of thecompressor 12 and thus preventing any compression of the fluid. Anysuitable means (not shown) may be used to control the admission of fluidunder gressure to the pipe 9 and cylinder 7. hould it be desired tooperate the compressor under full load continuously, as, for instance,when a constant pressure is not desired, a screw 13 may be threadedthrough the head of cylinder 7 so that the valve 1 may be heldpermanently to its seat 10, as shown in Fig. 2. Preferably, a lock nut14: is' rovided to secure the screw 13 in place. 11 Fig. 3 a slightmodification is shown in which the valve is arranged for a compressor inwhich the intake passages are 1n the upper portions of the compressor.In this case when the fluid under pressure supplied to the cylinder 15by the regulator through the pipe 16 is reduced, as, for instance, whenthe pressure in the receiver has been brought up to the ressure desired,a spring 17 which is place in the cylinder 15 on the valve side ofpiston 18 expands to lift 'the valve 19 from its seat 20. This form ofvalve may also be provided with a screw 21 threaded through the head ofthe cylinder 15 to hold the valve 19 to its seat when 'it is desired tooperate the compressor continuously under loaded conditions.

The modification shown in Fig. 4 is provided with a screw of aconsiderably difi'erent type than that shown at 13 m Fig. 2. In Fig. 4the screw 22'is rovlded at its lower end with a head 23 w ich fits intoa hole 24 drilled into the upper end of piston 25 and is covered andretained in place by 1 It is to be understood that while the presentshowin and description disclose certain specific em odiments of thepresent invention, other forms and modifications are ineluded within thespirit and scope thereof, as expressed in the appended claims.

What I claim is:

1. In an unloader for compressors, in combination, a cylindercarrying aplurality of valves, a seat for said cylinder, a. piston mounted on saidcylinder and means for holding said cylinder against its seat.

2. In an unloader for compressors, in combination, a cylinder carrying aplurality of valves, a seat for saidcylinder, a piston mounted on saidcylinder and means controlled by fluid pressure for new said cylinderagainst its seat.

3., In an unloader for compressors, in combination, a cylinder carryinga plurality of leaf valves, a seat mounted on the compressor for saidcylinder, a piston mounted on said cylinder and means for incl saidcylinder against its seat,

4. In an unloader tor compressors, in com bination, a cylinder carryinga lurality of leaf valves, a seat mounted on th sor for said cylinder, apiston mounted on said cylinder and me controlled by i'dnid ecompresaaeaeea pressure for holding said cylinder a 3 met its seat.

5. In an unloader for compressors, in combination, a cylinder carrying avalve, a seat for said cylinder, a piston mounted on said cylinder andmeans for holding said cylinder against its seat andalso away fromvitsseat.

6. In an unloader for compressors, in combination, a valve casing, saidvalve casing being adapted to seat against a compressor cylinder andfluid operated means to retain said valve casing against said compressorcylinder and positively acting means tohold said valve casing from itsseat,

7. In a compressor, in combination, a cylinder, an intake passage, avalve casing mounted in said intake passage and seatingagainst saidcylinder, fluid pressure means holding said valve casing against itsseat and means to withdraw said valve casing from its seat.

8. In a compressor, in combination, a cylinder an intake passage, avalve casing carrying a plurality of valves mounted in said intake passae, and seating a said cylinder, means olding said 'va ve 4" against itsseat and means to withw sai valve casing from its seat.

9. In a compressor, in combination, a cylinder, an intake passage, avalve ca mounted in said intake passage, and seating against saidcylinder, a piston mounted on said valve casing and fluid means uponsaid piston to hold said valve against its seat.

In testimony whereof, I have hnnto set my hand.

' RY V. G.

Wim;

S, N 'H Vrona

